A Correct Description of the Movements of Actin and Myosin

question 25

Multiple Choice

A correct description of the movements of actin and myosin fibers is:

• A)Binding with ATP shortens the muscle fiber;reverse binding elongates the fiber.
• B)The energy from breaking down ATP to ADP + P is used to convert actin into myosin.
• C)The calcium ions are used as energy to split ATP to shorten the fiber.
• D)When ADP and P come off myosin,the crossbridges move the actin filaments to shorten the muscle fiber.
• E)Actin filament heads break down ATP and then attach to a myosin filament to form cross-bridges.

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